Surface temperature dependent heat transfer coefficient

I'd like to apply a convection heat transfer boundary condition to the attached problem. Currently I am using a constant convection coefficient (h=10 W/m2K) on the interior gypsum surface. I have defined the room interior temperature using an interpolation function (Troom). I'd like to insert an analytical function for 'h', of the form '(Troom - T_surface)/Length'. 'T-surface' is, of course, being calculated by the solver. I added a point probe (Ts_Gyp) under 'Definitions', but not sure how to insert a function relating 'h' to 'T_surface (Ts_Gyp)'. Any suggestions?

I'd appreciate the help.

Regards,
Kaushik